Key parameters at a glance
- A radius of 2.21 Earth radii
- A mass of 5.52 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 36.516 days
- Semi-major axis 0.1977 AU
- Equilibrium temperature 425 K (152 °C)
- Distance from Earth 1,145.59 light-years
- Earth Similarity Index 0.598
- Travel time at Voyager 1 speed 20,202,427 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1026 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1658of 1978
top 83.8%
This planet
2.21R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1026 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.21 | 11.21 |
| Mass (M⊕) | 1.00 | 5.52 | 317.83 |
| Density (g/cm³) | 5.51 | 2.81 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 5.99 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 237192046
Gaia DR2
Gaia DR2 2103502465633672320
Gaia DR3
Gaia DR3 2103502465633672320
System
Kepler-1026
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 36.52 Earth days (10.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1977 AU.
Transit Fingerprint
Depth
0.086 %
Duration
3.588 h
Impact parameter b
0.553
Rp / R★
0.027302
Transit midpoint (BJD)
2,454,984.2922
Photometric dip
Transit produces a flux drop of 855 ppm lasting ≈ 3.59 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027302
Semi-major axis / stellar radius
67.300
Impact parameter (b)
0.553
Transit mid-time (BJD)
2,454,984.2922
Angular separation (arcsec)
0.56300
Eq. Temperature
425K
(152 °C)
Insolation (S⊕)
5.99
Earth = 1.00
Earth Similarity (ESI)
0.598
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-1026
Spectral Class
K-type orange
Effective Temperature
4,948 K — cooler than the Sun (5,778 K)
Estimated Age
4.57 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.750 R☉
Stellar Mass
0.790 M☉
Metallicity [Fe/H]
-0.02
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
1.846 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.818 mas
Total Proper Motion
13.685 mas/yr
PM Right Ascension
6.51 mas/yr
PM Declination
-12.04 mas/yr
Galactic Cartesian (pc)
x = 0.180 · y = -0.745 · z = 0.643
Equatorial (J2000)
RA 283.60530° · Dec 39.99793°
Galactic ℓ, b
69.902° · 16.512°
Ecliptic λ, β
292.855° · 62.362°
HTM-20 index
-28914590
Similar Worlds
Kepler-55 c
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 1,887.8 ly
K2-275 c
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 402.6 ly
Kepler-989 b
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 1,604.6 ly
Kepler-1874 b
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 1,330.7 ly
Kepler-169 e
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 1,325.9 ly
Kepler-229 b
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 2,694.9 ly